Chosing a correct title is very important in SEO world. Now in my view your 2nd option List of Rental in Sydney is the most appropriate title among others because majority of people write simple search terms like this not any fancy searches so this title is simple and also conveying the best meaning for the list of rentals.So you should go with it.

If you don`t want to index your member pages crawl and index by Google, use this syntax in robots.txt file ( User-agent: * Disallow: /) and you can also use <META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW"> for that page.

To choose the right page title depends on the right keywords you are looking forward. Also on the competition of those keywords would help in creating the Title. The competition and global searches would give the best answer and solution.